HtmlButton.OnPreRender Method (EventArgs)
.NET Framework (current version)
Raises the PreRender event and registers client script for generating a postback.
Assembly: System.Web (in System.Web.dll)
The OnPreRender method is used primarily by control developers extending the functionality of the HtmlButton control.
The following code example demonstrates how to override the OnPreRender method in a custom server control so that it always displays the HtmlButton with bold text.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %> <%@ Page Language="C#" AutoEventWireup="True" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>Custom HtmlButton - OnPreRender - C# Example</title> <script runat="server"> void Page_Load(Object sender, EventArgs e) { HtmlButton1.Attributes.Add("onclick","alert('Hello client-side world.');"); } void HtmlButton1_ServerClick(Object sender, EventArgs e) { Div1.InnerHtml = "Hello server-side world."; } </script> </head> <body> <form id="Form1" method="post" runat="server"> <h3>Custom HtmlButton - OnPreRender - C# Example</h3> <aspSample:CustomHtmlButtonOnPreRender id="HtmlButton1" runat="server" type="button" onserverclick="HtmlButton1_ServerClick" name="HtmlButton1">Html Button</aspSample:CustomHtmlButtonOnPreRender> <div id="Div1" runat="server" style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" /> </form> </body> </html>
using System.Web; using System.Security.Permissions; namespace Samples.AspNet.CS.Controls { [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)] public sealed class CustomHtmlButtonOnPreRender : System.Web.UI.HtmlControls.HtmlButton { protected override void OnPreRender(System.EventArgs e) { // Call the base class's OnPreRender method. base.OnPreRender(e); // Always display the HtmlButton with bold text. this.Style.Add("font-weight", "bold"); } } }
.NET Framework
Available since 1.1
Available since 1.1
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